Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cd8e6eff49ce55…

MALICIOUS

PDF

94.6 KB Created: 2021-07-23 03:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e65988db7c7e86ed569d12c6c2bf690d SHA-1: 201bad86530d4baa9b22b7a7b6254c6fc1794b30 SHA-256: 25cd8e6eff49ce55cf46f09d75055703f82fc25dac8a0801de14f614a957b013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of link farms on potentially compromised CMS uploads suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/083d8190e041aa95f38e5e8def0d2047/wejuwosofigigugo.pdf In PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f54dddb2b93---xodenaxamotedujizokizeni.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zukubomumasebejub.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/dafixanaxexat.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/38sscvni5ad0fp57furj3r8sh8/luneviku.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ca4c722eab3dc14de0a418f146134750/99562512092.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/uccka0bssjq7tt6d5hvib53er3/dipuwujulazapojaxojok.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/72439928763.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a28ee6b3597---gutomuvu.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/otmp0j9v6tesf0coifg8ft86f7/82397984335.pdfIn PDF document text
    • http://aimic.com/userfiles/file/87754029187.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/xavozufusewunudefed.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/xijexexom.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/545f5844c2512cfc2791d44b541a2558/xigoxoga.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/vajatabobujebazufixepisi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/chlmn2emmrho57f4htfnvqeds3/74004611106.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/19731367474.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c886c8177f---25073359010.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f908d51c7c6a8d6fad87326754ba079a/dexew.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/35325144289.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/pigogilomajanugofinuzaku.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/2aebd531f28bb44151db9ac8a1d8207e/figebanojosokibi.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16205690554046.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a729dd2657a---nidawu.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/numagezire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=plus+2+test+6+reading+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 16728 bytes
SHA-256: 10d668f596ac2686eee943df31b8b49df2ea9905821e44be3aac4f6dba84fba2
font_02_sfnt_off000152ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EC 10776 bytes
SHA-256: 1106868a6f7a7e3cddffc6fcdfe1a9af4543d1705e4f3596e80d283e3ce73f02